Re: akka disassociated on GC
Yes, that's the plan. If you use broadcast, please also make sure TorrentBroadcastFactory is used, which became the default broadcast factory very recently. -Xiangrui On Tue, Jul 22, 2014 at 10:47 PM, Makoto Yui yuin...@gmail.com wrote: Hi Xiangrui, By using your treeAggregate and broadcast patch, the evaluation has been processed successfully. I expect that these patches are merged in the next major release (v1.1?). Without them, it would be hard to use mllib for a large dataset. Thanks, Makoto (2014/07/16 15:05), Xiangrui Meng wrote: Hi Makoto, I don't remember I wrote that but thanks for bringing this issue up! There are two important settings to check: 1) driver memory (you can see it from the executor tab), 2) number of partitions (try to use small number of partitions). I put two PRs to fix the problem: 1) use broadcast in task closure: https://github.com/apache/spark/pull/1427 2) use treeAggregate to get the result: https://github.com/apache/spark/pull/1110 They are still under review. Once merged, the problem should be fixed. I will test the KDDB dataset and report back. Thanks! Best, Xiangrui On Tue, Jul 15, 2014 at 10:48 PM, Makoto Yui yuin...@gmail.com wrote: Hello, (2014/06/19 23:43), Xiangrui Meng wrote: The execution was slow for more large KDD cup 2012, Track 2 dataset (235M+ records of 16.7M+ (2^24) sparse features in about 33.6GB) due to the sequential aggregation of dense vectors on a single driver node. It took about 7.6m for aggregation for an iteration. When running the above test, I got another error at the beginning of the 2nd iteration when enabling iterations. It works fine for the first iteration but the 2nd iteration always fails. It seems that akka connections are suddenly disassociated when GC happens on the driver node. Two possible causes can be considered: 1) The driver is under a heavy load because of GC; so executors cannot connect to the driver. Changing akka timeout setting did not resolve the issue. 2) akka oddly released valid connections on GC. I'm using spark 1.0.1 and timeout setting of akka as follows did not resolve the problem. [spark-defaults.conf] spark.akka.frameSize 50 spark.akka.timeout 120 spark.akka.askTimeout120 spark.akka.lookupTimeout 120 spark.akka.heartbeat.pauses 600 It seems this issue is related to one previously discussed in http://markmail.org/message/p2i34frtf4iusdfn Are there any preferred configurations or workaround for this issue? Thanks, Makoto [The error log of the driver] 14/07/14 18:11:32 INFO scheduler.TaskSetManager: Serialized task 4.0:117 as 25300254 bytes in 35 ms 666.108: [GC [PSYoungGen: 6540914K-975362K(7046784K)] 12419091K-7792529K(23824000K), 5.2157830 secs] [Times: user=0.00 sys=68.43, real=5.22 secs] 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO client.AppClient$ClientActor: Executor updated: app-20140714180032-0010/8 is now EXITED (Command exited with code 1) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 14/07/14 18:11:38 INFO cluster.SparkDeploySchedulerBackend: Executor app-20140714180032-0010/8 removed: Command exited with code 1 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 672.596: [GC [PSYoungGen: 6642785K-359202K(6059072K)] 13459952K-8065935K(22836288K), 2.8260220 secs] [Times: user=2.83 sys=33.72, real=2.83 secs] 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc02.mydomain.org,54538) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) The full log is uploaded on https://dl.dropboxusercontent.com/u/13123103/driver.log [The error log of a worker] 14/07/14 18:11:38 INFO
Re: akka disassociated on GC
Hi Xiangrui, By using your treeAggregate and broadcast patch, the evaluation has been processed successfully. I expect that these patches are merged in the next major release (v1.1?). Without them, it would be hard to use mllib for a large dataset. Thanks, Makoto (2014/07/16 15:05), Xiangrui Meng wrote: Hi Makoto, I don't remember I wrote that but thanks for bringing this issue up! There are two important settings to check: 1) driver memory (you can see it from the executor tab), 2) number of partitions (try to use small number of partitions). I put two PRs to fix the problem: 1) use broadcast in task closure: https://github.com/apache/spark/pull/1427 2) use treeAggregate to get the result: https://github.com/apache/spark/pull/1110 They are still under review. Once merged, the problem should be fixed. I will test the KDDB dataset and report back. Thanks! Best, Xiangrui On Tue, Jul 15, 2014 at 10:48 PM, Makoto Yui yuin...@gmail.com wrote: Hello, (2014/06/19 23:43), Xiangrui Meng wrote: The execution was slow for more large KDD cup 2012, Track 2 dataset (235M+ records of 16.7M+ (2^24) sparse features in about 33.6GB) due to the sequential aggregation of dense vectors on a single driver node. It took about 7.6m for aggregation for an iteration. When running the above test, I got another error at the beginning of the 2nd iteration when enabling iterations. It works fine for the first iteration but the 2nd iteration always fails. It seems that akka connections are suddenly disassociated when GC happens on the driver node. Two possible causes can be considered: 1) The driver is under a heavy load because of GC; so executors cannot connect to the driver. Changing akka timeout setting did not resolve the issue. 2) akka oddly released valid connections on GC. I'm using spark 1.0.1 and timeout setting of akka as follows did not resolve the problem. [spark-defaults.conf] spark.akka.frameSize 50 spark.akka.timeout 120 spark.akka.askTimeout120 spark.akka.lookupTimeout 120 spark.akka.heartbeat.pauses 600 It seems this issue is related to one previously discussed in http://markmail.org/message/p2i34frtf4iusdfn Are there any preferred configurations or workaround for this issue? Thanks, Makoto [The error log of the driver] 14/07/14 18:11:32 INFO scheduler.TaskSetManager: Serialized task 4.0:117 as 25300254 bytes in 35 ms 666.108: [GC [PSYoungGen: 6540914K-975362K(7046784K)] 12419091K-7792529K(23824000K), 5.2157830 secs] [Times: user=0.00 sys=68.43, real=5.22 secs] 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO client.AppClient$ClientActor: Executor updated: app-20140714180032-0010/8 is now EXITED (Command exited with code 1) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 14/07/14 18:11:38 INFO cluster.SparkDeploySchedulerBackend: Executor app-20140714180032-0010/8 removed: Command exited with code 1 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 672.596: [GC [PSYoungGen: 6642785K-359202K(6059072K)] 13459952K-8065935K(22836288K), 2.8260220 secs] [Times: user=2.83 sys=33.72, real=2.83 secs] 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc02.mydomain.org,54538) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) The full log is uploaded on https://dl.dropboxusercontent.com/u/13123103/driver.log [The error log of a worker] 14/07/14 18:11:38 INFO worker.Worker: Executor app-20140714180032-0010/8 finished with state EXITED message Command exited with code 1 exitStatus 1 14/07/14 18:11:38 INFO actor.LocalActorRef: Message [akka.remote.transport.ActorTransportAdapter$DisassociateUnderlying] from Actor[akka://sparkWorker/deadLetters] to
Re: akka disassociated on GC
Hi Makoto, I don't remember I wrote that but thanks for bringing this issue up! There are two important settings to check: 1) driver memory (you can see it from the executor tab), 2) number of partitions (try to use small number of partitions). I put two PRs to fix the problem: 1) use broadcast in task closure: https://github.com/apache/spark/pull/1427 2) use treeAggregate to get the result: https://github.com/apache/spark/pull/1110 They are still under review. Once merged, the problem should be fixed. I will test the KDDB dataset and report back. Thanks! Best, Xiangrui On Tue, Jul 15, 2014 at 10:48 PM, Makoto Yui yuin...@gmail.com wrote: Hello, (2014/06/19 23:43), Xiangrui Meng wrote: The execution was slow for more large KDD cup 2012, Track 2 dataset (235M+ records of 16.7M+ (2^24) sparse features in about 33.6GB) due to the sequential aggregation of dense vectors on a single driver node. It took about 7.6m for aggregation for an iteration. When running the above test, I got another error at the beginning of the 2nd iteration when enabling iterations. It works fine for the first iteration but the 2nd iteration always fails. It seems that akka connections are suddenly disassociated when GC happens on the driver node. Two possible causes can be considered: 1) The driver is under a heavy load because of GC; so executors cannot connect to the driver. Changing akka timeout setting did not resolve the issue. 2) akka oddly released valid connections on GC. I'm using spark 1.0.1 and timeout setting of akka as follows did not resolve the problem. [spark-defaults.conf] spark.akka.frameSize 50 spark.akka.timeout 120 spark.akka.askTimeout120 spark.akka.lookupTimeout 120 spark.akka.heartbeat.pauses 600 It seems this issue is related to one previously discussed in http://markmail.org/message/p2i34frtf4iusdfn Are there any preferred configurations or workaround for this issue? Thanks, Makoto [The error log of the driver] 14/07/14 18:11:32 INFO scheduler.TaskSetManager: Serialized task 4.0:117 as 25300254 bytes in 35 ms 666.108: [GC [PSYoungGen: 6540914K-975362K(7046784K)] 12419091K-7792529K(23824000K), 5.2157830 secs] [Times: user=0.00 sys=68.43, real=5.22 secs] 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO client.AppClient$ClientActor: Executor updated: app-20140714180032-0010/8 is now EXITED (Command exited with code 1) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 14/07/14 18:11:38 INFO cluster.SparkDeploySchedulerBackend: Executor app-20140714180032-0010/8 removed: Command exited with code 1 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 672.596: [GC [PSYoungGen: 6642785K-359202K(6059072K)] 13459952K-8065935K(22836288K), 2.8260220 secs] [Times: user=2.83 sys=33.72, real=2.83 secs] 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc02.mydomain.org,54538) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) The full log is uploaded on https://dl.dropboxusercontent.com/u/13123103/driver.log [The error log of a worker] 14/07/14 18:11:38 INFO worker.Worker: Executor app-20140714180032-0010/8 finished with state EXITED message Command exited with code 1 exitStatus 1 14/07/14 18:11:38 INFO actor.LocalActorRef: Message [akka.remote.transport.ActorTransportAdapter$DisassociateUnderlying] from Actor[akka://sparkWorker/deadLetters] to Actor[akka://sparkWorker/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FsparkWorker%4010.0.1.9%3A60601-39#1322474303] was not delivered. [13] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and
Re: akka disassociated on GC
Hi Xiangrui, (2014/07/16 15:05), Xiangrui Meng wrote: I don't remember I wrote that but thanks for bringing this issue up! There are two important settings to check: 1) driver memory (you can see it from the executor tab), 2) number of partitions (try to use small number of partitions). I put two PRs to fix the problem: For the driver memory, I used 16GB/24GB and it was enough for the execution (full GC was not happen). I check it by using jmap and top command. BTW, I was faced that the required memory for driver was oddly proportional to # of tasks/executors. When I used 8GB for the driver memory, I got OOM in the task serialization. It could be considered as a possible memory leak in the task serialization to be addressed in the future. Each task size is about 24MB and # of tasks/executors is 280. The size of each task result was about 120MB or so. 1) use broadcast in task closure: https://github.com/apache/spark/pull/1427 Does this PR reduce the required memory for the driver? Is there a big difference in explicit broadcast of feature weights and implicit task serialization including feature weights? 2) use treeAggregate to get the result: https://github.com/apache/spark/pull/1110 treeAggregate would reduce the time for aggregation and the required memory of a driver for sure. I would test it. However, the problem that I am facing now is an akka connection issue on GC, or under heavy loads. And thus, I think the problem is lurking behind even though the consumed memory size is reduced by treeAggregate. Best, Makoto
akka disassociated on GC
Hello, (2014/06/19 23:43), Xiangrui Meng wrote: The execution was slow for more large KDD cup 2012, Track 2 dataset (235M+ records of 16.7M+ (2^24) sparse features in about 33.6GB) due to the sequential aggregation of dense vectors on a single driver node. It took about 7.6m for aggregation for an iteration. When running the above test, I got another error at the beginning of the 2nd iteration when enabling iterations. It works fine for the first iteration but the 2nd iteration always fails. It seems that akka connections are suddenly disassociated when GC happens on the driver node. Two possible causes can be considered: 1) The driver is under a heavy load because of GC; so executors cannot connect to the driver. Changing akka timeout setting did not resolve the issue. 2) akka oddly released valid connections on GC. I'm using spark 1.0.1 and timeout setting of akka as follows did not resolve the problem. [spark-defaults.conf] spark.akka.frameSize 50 spark.akka.timeout 120 spark.akka.askTimeout120 spark.akka.lookupTimeout 120 spark.akka.heartbeat.pauses 600 It seems this issue is related to one previously discussed in http://markmail.org/message/p2i34frtf4iusdfn Are there any preferred configurations or workaround for this issue? Thanks, Makoto [The error log of the driver] 14/07/14 18:11:32 INFO scheduler.TaskSetManager: Serialized task 4.0:117 as 25300254 bytes in 35 ms 666.108: [GC [PSYoungGen: 6540914K-975362K(7046784K)] 12419091K-7792529K(23824000K), 5.2157830 secs] [Times: user=0.00 sys=68.43, real=5.22 secs] 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc09.mydomain.org,34565) 14/07/14 18:11:38 INFO client.AppClient$ClientActor: Executor updated: app-20140714180032-0010/8 is now EXITED (Command exited with code 1) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 14/07/14 18:11:38 INFO cluster.SparkDeploySchedulerBackend: Executor app-20140714180032-0010/8 removed: Command exited with code 1 14/07/14 18:11:38 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc30.mydomain.org,59016) 14/07/14 18:11:38 ERROR network.ConnectionManager: Corresponding SendingConnectionManagerId not found 672.596: [GC [PSYoungGen: 6642785K-359202K(6059072K)] 13459952K-8065935K(22836288K), 2.8260220 secs] [Times: user=2.83 sys=33.72, real=2.83 secs] 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc03.mydomain.org,43278) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc02.mydomain.org,54538) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing ReceivingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) 14/07/14 18:11:41 INFO network.ConnectionManager: Removing SendingConnection to ConnectionManagerId(dc18.mydomain.org,58100) The full log is uploaded on https://dl.dropboxusercontent.com/u/13123103/driver.log [The error log of a worker] 14/07/14 18:11:38 INFO worker.Worker: Executor app-20140714180032-0010/8 finished with state EXITED message Command exited with code 1 exitStatus 1 14/07/14 18:11:38 INFO actor.LocalActorRef: Message [akka.remote.transport.ActorTransportAdapter$DisassociateUnderlying] from Actor[akka://sparkWorker/deadLetters] to Actor[akka://sparkWorker/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FsparkWorker%4010.0.1.9%3A60601-39#1322474303] was not delivered. [13] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'. 14/07/14 18:11:38 ERROR remote.EndpointWriter: AssociationError [akka.tcp://sparkwor...@dc09.mydomain.org:39578] - [akka.tcp://sparkexecu...@dc09.mydomain.org:33886]: Error [Association failed with [akka.tcp://sparkexecu...@dc09.mydomain.org:33886]] [ akka.remote.EndpointAssociationException: Association failed with [akka.tcp://sparkexecu...@dc09.mydomain.org:33886] Caused by: akka.remote.transport.netty.NettyTransport$$anonfun$associate$1$$anon$2: Connection refused: dc09.mydomain.org/10.0.1.9:33886] 14/07/14 18:11:38 INFO worker.Worker: Asked to launch executor app-20140714180032-0010/32 for Spark shell 14/07/14 18:11:38 WARN
